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Note Subsequent events- Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 28, 2019 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 23, 2019
Subsequent Events |  |  |  |  |  |
Common stock purchases |  |  | $ 127,465 | $ 77,420 | $ 2,202 |
Accelerate Share Repurchase |  |  |  |  |  |
Subsequent Events |  |  |  |  |  |
Stock Repurchase Program Authorized Amount |  | $ 75,000 |  |  |  |
Common stock purchases |  | $ 79,500 |  |  |  |
Treasury Stock |  |  |  |  |  |
Subsequent Events |  |  |  |  |  |
Common stock purchases |  |  | 127,379 | 81,938 | $ 2,202 |
Surplus |  |  |  |  |  |
Subsequent Events |  |  |  |  |  |
Common stock purchases |  |  | $ 86 | $ (4,518) |  |
Subsequent event |  |  |  |  |  |
Subsequent Events |  |  |  |  |  |
Stock Repurchase Program Authorized Amount |  |  |  |  |  | $ 250,000
Subsequent event | Accelerate Share Repurchase |  |  |  |  |  |
Subsequent Events |  |  |  |  |  |
Subsequent Events Date | Feb. 28, 2019 |  |  |  |  |
Stock Repurchase Program Authorized Amount | $ 250,000 |  |  |  |  |
Subsequent event | Treasury Stock | Accelerate Share Repurchase |  |  |  |  |  |
Subsequent Events |  |  |  |  |  |
Common stock purchases | 200,000 |  |  |  |  |
Subsequent event | Surplus | Accelerate Share Repurchase |  |  |  |  |  |
Subsequent Events |  |  |  |  |  |
Common stock purchases | $ 50,000 |  |  |  |  |

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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- Definition Date the event occurred after the balance sheet date but before financial statements are issues or available to be issued, in CCYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 855 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6842918&loc=SL6314017-165662 + Details
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- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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